JP6368356B2 - Double filament incandescent lamp for automotive front illumination - Google Patents

Description

  The present invention relates to an electric lamp, in particular a lamp for use in the front illumination of a motor vehicle. The invention further relates to a vehicle headlight.

  Automotive headlights, i.e. headlights for use in vehicles such as cars, motorcycles, trucks or other types of vehicles, generally include reflectors and lamps mounted therein. Have. Known incandescent lamps, in particular halogen lamps, generally have a base and a burner. The base provides a mechanical and electrical connection to the automobile headlight, while the burner has actual light emitting elements, in particular filaments. The light emitted from the filament is reflected by the reflector so as to form a beam for illuminating the front of the vehicle.

  Different types of incandescent lamps are known, and these lamps have one or more filaments arranged in a container.

  Patent Document 1 discloses a halogen incandescent lamp for a front light of an automobile. Within the vessel is placed a filament that is dimensioned so that operation at an operating voltage of 13.2 V and operation at a power of 22-27 W results in a luminous flux of 400-660 lumens (lm). The lamp has one filament with an outer diameter of 17-23 turns, a length of 2.1-3.6 mm and a turn of 0.9-1.3 mm. The filament wire has a diameter of 95-105 μm. The interior of the vessel is filled with a halogen and rare gas fill gas at a cold fill pressure of 0.7-1.5 Mpa.

  Patent document 2 relates to a lamp-reflector unit having first and second light sources arranged axially on a lamp shaft. A low voltage halogen incandescent lamp is secured to the reflector neck with a bonding agent. The first filament has a rated output of 35 W and the second filament has a rated output of 50 W. During lamp operation, the first filament generates a narrow light beam and the second filament generates a wide light beam. When operated simultaneously, a circular symmetric light beam with high intensity is obtained.

Patent Document 3 describes a halogen bulb having two filaments located in a lamp body. The first filament is partially surrounded by the baffle and has a nominal voltage of 13.2V or 28V and a power of 55-80W. In different embodiments, the first filament has 17.5 or 15.5 turns. The second filament has a nominal voltage of 13.2V or 28V and a power of 17-22W. Different embodiments have 27 or 28 turns.
Revision 4 of UNECE Regulation 37 dated October 26, 2005 regulates the front illumination lamp of category HS1 cars. These lamps are double filament lamps with a low beam filament shielded by a baffle and an unshielded high beam filament and with a baffle extending partially between the two filaments. The rule is that two filaments supplied with a test voltage of 13.2 V should ideally operate at a power of 35 W each and emit a luminous flux of 525 lm for the low beam and 825 lm for the high beam filament. It stipulates that it must not

DE 10 2011 004 290 US 2007/0008720 A1 WO 2008/055943 A2

  The aim is to propose a lamp with a filament device that is well suited for automotive front illumination applications.

  According to an aspect of the invention, a lamp according to claim 1 and a vehicle headlight according to claim 11 are proposed. The dependent claims refer to preferred embodiments.

  The lamp according to an aspect of the invention has a base for mechanical and electrical connection to a vehicle headlight. Electrical contacts can protrude out of the base, in particular from behind. The base further preferably has a positioning ring which serves to attach the lamp to the vehicle headlight reflector in a defined position and orientation. The ramp axis can be defined as the longitudinal axis through the center of the positioning ring. The positioning ring can have a radial protrusion, which can serve for mechanical fixation and accurate positioning. It is particularly preferred to provide one reference protrusion for defining the radial reference direction R.

  The lamp further comprises a burner with an at least partially transparent, preferably glass sealed container. According to the invention, at least first and second filaments are arranged in the container and are provided at a distance from each other. Preferably, the filaments are spaced along the longitudinal axis of the lamp, i.e., the axis extending through the center of the cylindrical container, for example.

  According to one aspect, the baffle is disposed proximate to the first filament. As will become apparent in connection with the preferred embodiment, the baffle can in particular be arranged to cover the axial extent of the first filament, i.e. the first along its entire axial length. The filaments may be arranged in the radial direction. Thus, a portion of the light emitted from the first filament and emitted in the spatial direction of the adjacent baffle is blocked by the baffle.

  Further, the baffle can be arranged to shield the first filament from the second filament, i.e. at least partially arranged between the filaments. The baffle thus serves to separate the angular range illuminated by both filaments from the angular range illuminated only by the second filament, where light emitted from the first filament is blocked by the baffle. Corresponding portions of the reflectors reflect light emitted from the first filament (which may be referred to as a low beam filament) to the first beam (low beam, with a bright / dark cutoff). And similarly, the light emitted from the second filament (eg, a high beam filament) may be reflected to a reflected beam (high beam) without a light / dark cutoff.

  Each of the first and second filaments is configured to operate when supplied with a voltage of 13.2 V with a power in the range of 35-38 W.

  However, the light output resulting from the lamp is different for the two filaments, and when only the first filament is operated at the voltage and power shown above, the lamp emits light with a luminous flux of 500-700 lm. When only the second filament is operated at the voltage and power indicated above, the lamp emits light with a luminous flux of 800-1000 lm. These differences in light output are due, for example, to partial shading in the baffle and optionally in the opaque cover at the tip of the container.

  According to an aspect of the present invention, each of the first and second filaments has a filament wire wound around the filament axis. The filament wire is preferably wound into a single winding structure. The filament axes of both filaments are preferably straight and arranged in parallel, more preferably arranged parallel to the longitudinal axis. According to one aspect, the number of winding turns of the filament wire for each of the first and second filaments is 16-23 turns. More preferably, 18-22 turns for both filaments.

  A lamp according to one or more of the above aspects of the invention can be used flexibly for front illumination of a motor vehicle.

  In a preferred embodiment, the filament wire diameter may be 115-130 μm. The length of the winding structure along the filament axis can be 3.6-4.8 mm. The outer diameter of the winding structure for each of the first and second filaments may be 0.8-1.2 mm.

  According to one embodiment, the container may be filled with a fill gas having at least a halogen and one noble gas or mixture of gases. In particular, the noble gas / mixture may have a gas selected from the group comprising xenon, krypton and argon. The halogen can be bromide and / or chloride. The fill gas can be provided into the container at a cold fill pressure of 0.4-1.2 MPa.

  According to a preferred embodiment of the invention, the container has a circular cylindrical part surrounding the filament. The circular cylindrical portion of the container may have an outer diameter of 8-16 mm.

  According to a further preferred embodiment, at least three holding wires can be arranged in the container. The filament can be secured to a holding wire. A baffle can also be secured to one of the retaining wires. It is preferred to have a retention wire extending from the container pinch seal that projects into the interior of the container. In one embodiment, the retention bar is positioned away from the pinch seal. The retention bar may surround the retention wire to provide mechanical fixation of the retention wire.

  In one embodiment, the base has three electrical contacts, and the three retaining wires are disposed extending from the container pinch seal to the interior thereof. Each of the retention wires is electrically connected to one of the electrical contacts. The first filament can be electrically connected between the first and third retention wires, and the second filament can be electrically connected between the second and third retention wires. . Thus, the filaments share a common electrical connection.

  According to a preferred embodiment of the present invention, a reference protrusion can be provided on the base. The reference protrusion may protrude in the radial direction. A plane of symmetry can be defined by the reference protrusion. Preferably, the plane of symmetry is arranged to include the longitudinal axis of the lamp and is oriented radially towards the reference protrusion.

  According to a preferred embodiment, at least the filament and baffle arrangement can be symmetric about a plane of symmetry defined as described above. This creates a symmetric beam pattern. In the case of a beam pattern with a light / dark cutoff, the light / dark cutoff is arranged horizontally.

  According to a further aspect, a vehicle headlight with a reflector may comprise a lamp according to one of the above aspects. In particular, the vehicle headlamp may be a motorcycle headlamp.

  These and other aspects of the invention will be apparent from and will be elucidated with reference to the embodiments described hereinafter.

1 shows a perspective view of a lamp according to an embodiment of the present invention. 2 shows an enlarged sectional view of a part of the lamp of FIG. 1 in a section taken along line R. FIG. 2 shows a schematic view of a headlight of a vehicle with a lamp according to FIG.

  FIG. 1 shows a perspective view of a halogen lamp 10 of an automobile.

  The lamp 10 has a base 12 and a burner 14 fixed to the base 12.

  The base 12 has a positioning ring 16 that includes three positioning protrusions (only two are shown in FIG. 1) 18a, 18b protruding radially from the base 12. A reference plane for the mounting position of the lamp 10 on the reflector (FIG. 3) can be defined by the upper part of the three positioning protrusions. The lamp axis X can be defined as the longitudinal axis of the lamp 10 through the center of the positioning ring 16 and perpendicular to this reference plane.

  The lamp 10 can be secured to the vehicle headlight as shown in FIG. 3, and the protrusions 18a, 18b provide accurate positioning. The protrusion 18b functions as a reference protrusion that defines the radial reference direction R. The symmetry plane is positioned so as to include a reference direction R extending from the lamp axis X and the longitudinal axis X toward the center of the reference protrusion 18b.

  The burner 14 has a glass container 22 having a central portion 24 having a circular cylindrical shape. At the top, the otherwise transparent container 22 has a coated portion 26 that is opaque. At the bottom, the container 22 is sealed with a pinch seal 28 that is fixed to the base 12.

  Projecting into the container 22 from the pinch seal 28 are three holding wires 30a, 30b, 30c. The holding wires 30a, 30b, and 30c are further fixed by a holding bar 32 disposed away from the pinch seal 28. Further, the first filament 34 (low beam filament) and the second filament 36 (high beam filament) are arranged fixed to the holding wires 30a, 30b, and 30c.

  A baffle 40 is disposed proximate to the first filament 34. As shown, the baffle is provided to cover the axial extent of the first filament 34 and thus partially shields the light emitted radially from the first filament 34. Further, a front portion 42 of the baffle 40 is disposed between the first and second filaments 34, 36 and thus serves to shield the filaments 34, 36 from each other.

  As shown in detail in the enlarged cross-sectional view of FIG. 2, the first low beam filament 34 is connected to the first holding wire 30a at one end and to the baffle 40 at the other end, 3 holding wires 30c. The second high beam filament 36 is fixed to the second holding wire 30b and the third holding wire 30c. With these connections, the filaments 34 and 36 are both mechanically held at predetermined positions in the container and electrically connected to the holding wires 30a, 30b, and 30c. The holding wire is connected to an electrical contact 20 that protrudes from a lower portion of the base 12 inside the base 12. Thus, the filaments 34, 36 are activated by supplying power to the electrical contacts 20.

  FIG. 2 shows a cross-sectional view of the center of the container 22, the circular cylindrical portion 24. As shown, the filaments 34, 36 are each provided as a single winding structure of filament wire wound around a linear filament axis. Both filament axes are parallel to the longitudinal axis X of the lamp 10.

  The circular cylindrical portion 24 of the container 22 surrounding the filaments 34, 36 has an outer diameter of 12.8 mm.

  In a preferred embodiment, the filament wire used for the first filament 34 comprises tungsten, and in particular can be potassium doped tungsten. The wire in the example has a diameter of 122 μm and is wound with 20 turns. The outer diameter of the winding structure of the first filament 34 is 1.0 mm, and the length of the winding structure is 4.2 mm.

  The second filament 36 has the same winding structure as the first filament 34. A second filament 36 of potassium-doped tungsten having a diameter of 119 μm is wound with 20 turns of an outer diameter of 1.0 mm along a length of 4.0 mm.

  The inside of the sealed container 22 is filled with a filling gas. In a preferred embodiment, the fill gas is a mixture of xenon and krypton supplied at a cold fill pressure of 1 MPa. In addition, certain amounts of halogen, chloride and bromide are enclosed in container 22.

  In operation of the lamp 10, a nominal voltage of 13.2V is applied to either the first filament 34 or the second filament 36, i.e., the first holding wire 30a and the third holding wire 30, the second holding wire. When applied between 30b and the third holding wire 30c, the first and second filaments 34, 36 operate at a power of 36-36.5 W, respectively. Due to the partial shielding in the baffle 40 and the coated part 26, the lamp emits a light beam of 580 lm in the operation of the first filament and a light beam of 875 lm in the operation of the second filament 36.

  FIG. 3 schematically shows the headlight 50, in which the lamp 10 described above is schematically shown disposed in the reflector 46. Light emitted from the filaments 34, 36 (not shown in FIG. 3) is reflected by the reflector 46 to form different illumination beams. Light from the second (high beam) filament 36 is reflected by both the upper and lower portions of the reflector 46 to form a high beam without a light / dark cutoff.

  The light emitted from the first low beam filament 34 is partially shielded by the baffle 40 so that only the upper portion of the reflector 46 is illuminated. The upper portion of the reflector 46 is formed to reflect light from the first filament 34 so as to form an illumination beam with a light / dark cutoff.

  The arrangement of the filaments 34, 36 and the baffle 40 is precisely symmetrical with respect to the plane of symmetry defined by the axes R, X. Therefore, the resulting beam pattern is also symmetric. In particular, the low beam pattern has a horizontal light / dark cutoff.

  While the invention has been illustrated and described in detail in the drawings and foregoing description, such illustration and description are to be considered illustrative or exemplary and not restrictive, and the invention is disclosed; However, the present invention is not limited to the embodiment.

  Variations from the disclosed embodiments can be understood and attained by those skilled in the art from a review of the drawings, the disclosure, and the appended claims, when practicing the claimed invention. In the claims, the word “comprising” does not exclude other elements or steps, and the indefinite article “a” or “an” does not exclude a plurality.

  The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measured cannot be used to advantage. Any reference signs in the claims should not be construed as limiting the scope.

Claims (10)

A lamp for front illumination of a car,
-A base for mechanical and electrical connection to automobile headlights;
A burner fixed to the base, the burner having a sealed transparent container;
-At least first and second filaments disposed in the transparent container;
A baffle disposed adjacent to the first filament so as to shield the second filament from the first filament, the first filament having a supply voltage of 13.2V When supplied, the first filament is operated with a power greater than 35 W and less than 38 W, and a light beam of 500-700 lm is emitted,
-When the second filament is supplied with a supply voltage of 13.2 V, the second filament is operated with a power greater than 35 W and not greater than 38 W and radiates a light beam of 800-1000 lm. And
Each of the first and second filaments has a filament wire wound around a filament axis;
The number of winding turns of each of the first and second filaments is 16-23;
The base has a reference protrusion defining a plane of symmetry;
- the first and the second filament and said baffle are arranged symmetrically with respect to the symmetry plane,
lamp. The diameter of the filament wire of the first and second filaments is 115-130 μm;
The lamp according to claim 1. The length of the first and second filaments along the filament axis is 3.6-4.8 mm;
The lamp according to claim 1 or 2. The outer diameter of the first and second filaments is 0.8-1.2 mm;
The lamp according to any one of claims 1 to 3. The transparent container is filled with a filling gas, the filling gas comprising at least one noble gas from the group comprising xenon, krypton and argon;
The filling gas is provided in the transparent container at a cold filling pressure of 0.4-1.2 MPa,
The lamp according to any one of claims 1 to 4. The filling gas comprises an amount of halogen containing at least chloride and / or bromide,
The lamp according to claim 5. The transparent container has a circular cylindrical portion surrounding the first and second filaments;
-In the circular cylindrical part, the transparent container has an outer diameter of 8-16 mm;
The lamp according to any one of claims 1 to 6. -At least three retaining wires are arranged in the transparent container;
- the first and the second filament and said baffle is secured to the holding wire,
- said retaining wire extends inside the transparent container from the pinch seal of the transparent container,
A holding bar is arranged away from the pinch seal, the holding bar surrounding the holding wire;
The lamp according to any one of claims 1 to 7. The base has three electrical contacts;
- three holding wire, the are arranged to extend inside the transparent container from the pinch seal of the transparent container, each of said retaining wire are electrically connected to one of said electrical contacts,
- the first filament is electrically connected between the first holding wire and the third holding wire, the second filament, and the second holding wire third holding wire Electrically connected between,
The lamp according to any one of claims 1 to 8.   A vehicle headlight comprising the lamp and reflector according to any one of claims 1 to 9.

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